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I have never measured mine, but I guess it's the same... You can always up the spring rates and do what you can to limit weight transfer. I'd guess that 4" is about as much as you'd move the coils up and down in steady state, so maybe try to limit the damage as much as possible. Do you have good bushings in the rear? Acadiana sells aluminum parts.

Update; rear springs are now around 350# , no bar, 1/8 toe out static. pretty big rear spoiler with tipplates. 4th "new " engine. This one runs well and uses no oil. Ran all day @ Sebring chump 14hrs. The car is really planted at this point and I will reduce the rear downforce a little bit.
Now I like it. Just need a little more power...
# 551 below
MM